Former U.S. President George Bush says his son, Texas Gov. George W. Bush, was “a rambunctious little guy” but that the leading Republican presidential contender never gave his parents cause to believe he used illegal drugs. “All this stuff about George’s totally irresponsible past, we never saw it,” Bush said in a television interview on the Fox News Channel program “The Edge With Paula Zahn.” “Barbara and I never saw this. We knew he had some problems that he faced up to, but no different than most kids,” the former president said. The younger Bush, 53, the front-runner for the Republican presidential nomination in 2000, has been dogged by unsubstantiated rumors about his alleged use of cocaine in the past.